From nobody Sat Feb 7 10:16:07 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass(p=none dis=none) header.from=gmail.com ARC-Seal: i=1; a=rsa-sha256; t=1632402463; cv=none; d=zohomail.com; s=zohoarc; b=NsHhZgS6HEACgKxiWK5Z/uWK0p8oGT6xbcVTPXocNCHXjMO/eAnDE97w7yGDHcYsZnuCGn5S1gcD3sWAEi2IQS7PIdnnnSrqERvn0BsGCW2eUlvxkPVz4A1wADrIz33C0czifHcFMpGk3mLCIXYjr6ySTdQs/2gAoXfNg+r2GAc= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1632402463; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=fpEmkp363zGTNG/sREpOTD2+RNFlDcJmlTvIa8Vah1w=; b=QIe70vvl9Iw38BiQjLr5ACvfpkeS+EedL1oQvhDjhGiIrNaq25d8UJguogEmPbqz8osUhKR11LIZj/q3X6s8PwRJgmt9qeoPAjHyQbcCVXvqhzJZtKKHrXtRHAJb3OyZOlLvxv6Sw8P41zWdN0m/YQRK1woY4UX7GRqXGioISvw= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1632402463294700.0606100794664; Thu, 23 Sep 2021 06:07:43 -0700 (PDT) Received: from list by lists.xenproject.org with outflank-mailman.194181.345986 (Exim 4.92) (envelope-from ) id 1mTORj-0002YV-IA; Thu, 23 Sep 2021 13:07:27 +0000 Received: by outflank-mailman (output) from mailman id 194181.345986; Thu, 23 Sep 2021 13:07:27 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1mTORj-0002YO-ED; Thu, 23 Sep 2021 13:07:27 +0000 Received: by outflank-mailman (input) for mailman id 194181; Thu, 23 Sep 2021 13:07:26 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1mTOHp-0004it-7d for xen-devel@lists.xenproject.org; Thu, 23 Sep 2021 12:57:13 +0000 Received: from mail-lf1-x136.google.com (unknown [2a00:1450:4864:20::136]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id af9177de-3a8d-49c1-bd4a-675a79d72820; Thu, 23 Sep 2021 12:55:14 +0000 (UTC) Received: by mail-lf1-x136.google.com with SMTP id g41so26148978lfv.1 for ; Thu, 23 Sep 2021 05:55:14 -0700 (PDT) Received: from localhost.localdomain ([185.199.97.5]) by smtp.gmail.com with ESMTPSA id o12sm453010lft.254.2021.09.23.05.55.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 23 Sep 2021 05:55:12 -0700 (PDT) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: af9177de-3a8d-49c1-bd4a-675a79d72820 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=fpEmkp363zGTNG/sREpOTD2+RNFlDcJmlTvIa8Vah1w=; b=bpnFyr4vGY6stFAtsMo9qX7ZkqJW7256vkP2otZyANDs5R1Qyh53a03oaQJiIO9Tfi VADZFcegMz3d43HptXQRRBCE9Gxx0vMyS8AniNFVc6xLaJS/vx7Kr/+07sfBFJGV6Xpy LWMfQ+PUwmyqY1X4GEDMUqma1EjVbZWsOyffYXaXWsC3eFY2Q3Tjq5sZYjCYc7l44EbK +BEtyp5dq7r4QF+GRr9FVsKAJNxYFta58KVMQ46xAP7fQOZS6a7hNPN2rK1zMl8tkN0i jQnXs/gd5/oBSDCzcsb/stq18qcDugzMPAdsbGVksToFDkWLkYEExgyQFAkWHJhxMcTk 0iYA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=fpEmkp363zGTNG/sREpOTD2+RNFlDcJmlTvIa8Vah1w=; b=XNnh9CH91uvB4PJSWypfv+a04zGMlc4T0gpFr0UW/wldx8mHS8w+AfqnBoNeEld63T FkMAWn85cOS+DWTIt/qDxow0sTpgNhiNo1ISDEyDaugaJIDn5iQQYEZhr55tR9ASs6X0 YHYKxYgiIky21a+m90TD+uwgD0ZP/fcn5c/94Ff+ipXGvsiTasr+p15aq+E+A7AbaNtd WQ5OjQE37XOAyDcKzvvCjCbHzhFshhHDfsw+IAoWOpiaH3H2GWo+SGm4rX92idwe+fEn Ad60xkX8w5NC4lrVrVUwgmgecjVWElRnVd2BzQRFjDEbKyM5kzvaXrn9oM8KKPgIz2R9 Z0vw== X-Gm-Message-State: AOAM533t8YI7tTjNk9C3SUk3nz/tlb3MMoGhftBhiAuFhRKfAYti2fex DzEdRyooIXWUDc8uKlfJWcbMqWmt9HcHiQ== X-Google-Smtp-Source: ABdhPJzdYDxTei6IVbz6wkAAT9SIcXwlU/2hhWG9paV9ZKyig0hoON0I5dQvzIu3rLdWmGK1j+rN+w== X-Received: by 2002:a05:6512:32c6:: with SMTP id f6mr3953415lfg.503.1632401713136; Thu, 23 Sep 2021 05:55:13 -0700 (PDT) From: Oleksandr Andrushchenko To: xen-devel@lists.xenproject.org Cc: julien@xen.org, sstabellini@kernel.org, oleksandr_tyshchenko@epam.com, volodymyr_babchuk@epam.com, Artem_Mygaiev@epam.com, roger.pau@citrix.com, jbeulich@suse.com, bertrand.marquis@arm.com, rahul.singh@arm.com, Oleksandr Andrushchenko Subject: [PATCH v2 08/11] vpci/header: Emulate PCI_COMMAND register for guests Date: Thu, 23 Sep 2021 15:54:58 +0300 Message-Id: <20210923125501.234252-9-andr2000@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210923125501.234252-1-andr2000@gmail.com> References: <20210923125501.234252-1-andr2000@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1632402464836100003 Content-Type: text/plain; charset="utf-8" From: Oleksandr Andrushchenko Add basic emulation support for guests. At the moment only emulate PCI_COMMAND_INTX_DISABLE bit, the rest is not emulated yet and left as TODO. Signed-off-by: Oleksandr Andrushchenko Reviewed-by: Michal Orzel --- New in v2 --- xen/drivers/vpci/header.c | 35 ++++++++++++++++++++++++++++++++--- 1 file changed, 32 insertions(+), 3 deletions(-) diff --git a/xen/drivers/vpci/header.c b/xen/drivers/vpci/header.c index bdd18599b205..99f9c37dfb00 100644 --- a/xen/drivers/vpci/header.c +++ b/xen/drivers/vpci/header.c @@ -452,6 +452,32 @@ static void cmd_write(const struct pci_dev *pdev, unsi= gned int reg, pci_conf_write16(pdev->sbdf, reg, cmd); } =20 +static void guest_cmd_write(const struct pci_dev *pdev, unsigned int reg, + uint32_t cmd, void *data) +{ + /* TODO: Add proper emulation for all bits of the command register. */ + + if ( (cmd & PCI_COMMAND_INTX_DISABLE) =3D=3D 0 ) + { + /* + * Guest wants to enable INTx. It can't be enabled if: + * - host has INTx disabled + * - MSI/MSI-X enabled + */ + if ( pdev->vpci->msi->enabled ) + cmd |=3D PCI_COMMAND_INTX_DISABLE; + else + { + uint16_t current_cmd =3D pci_conf_read16(pdev->sbdf, reg); + + if ( current_cmd & PCI_COMMAND_INTX_DISABLE ) + cmd |=3D PCI_COMMAND_INTX_DISABLE; + } + } + + cmd_write(pdev, reg, cmd, data); +} + static void bar_write(const struct pci_dev *pdev, unsigned int reg, uint32_t val, void *data) { @@ -599,9 +625,12 @@ static int add_bar_handlers(const struct pci_dev *pdev= , bool is_hwdom) struct vpci_bar *bars =3D header->bars; int rc; =20 - /* Setup a handler for the command register: same for hwdom and guests= . */ - rc =3D vpci_add_register(pdev->vpci, vpci_hw_read16, cmd_write, PCI_CO= MMAND, - 2, header); + if ( is_hwdom ) + rc =3D vpci_add_register(pdev->vpci, vpci_hw_read16, cmd_write, + PCI_COMMAND, 2, header); + else + rc =3D vpci_add_register(pdev->vpci, vpci_hw_read16, guest_cmd_wri= te, + PCI_COMMAND, 2, header); if ( rc ) return rc; =20 --=20 2.25.1